A source is producing 15 oscillations (waves) in 3 seconds. Find its frequency?

15 Hz

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5 Hz

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0.2Hz

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0.66Hz

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Solution

The correct option is D 5 Hz
Frequency of a wave (as sound wave) is defined as the number of oscillations per second,
$f = \frac{number of oscillations}{time (in seconds)}$
Given:
No. of oscillations $= 15$ , $t i m e = 3 s$
$∴ f = \frac{15}{3} = 5 H z$
Option (B) is correct.

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